Sofa



FIG. 1 is a perspective view of one side of the sofa, the appearance of the other side of the sofa being identical;

FIG. 2 is an elevated perspective view of the front of the sofa;

FIG. 3 is a rear elevation of the sofa; and,

FIG. 4 is a side elevation of the sofa. 

The ornamental design for a sofa, as shown and described. 